We are sorry.
This could have been the best Cook-Off ever on CodeChef. The problems were that good and we had the highest participation ever. And we made a mess of it. We suspect it was recently added feature (subtask solutions being shown independently) that fired some expensive queries which made the load on MySQL shoot up! We have taken down the feature and the site is running normally now. But it took us a lot of time to do this. We will further investigate the issue and inform you the details of what went wrong.
We are embarrassed today. And we feel very sorry for the efforts of the problem setter and the tester and the contest admin who toiled so hard to bring this contest to you. We also feel sorry that your time that has been wasted.
We know this is not the first time that we have goofed up. We will correct this and try and make sure that this is the last such experience for all of you. And we still hope that you enjoyed the problems.